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OPERATION
MODEL 169
t
WARNING
To avoid
electrical
shock
and/or
instru-
ment
damage,
do not
connect
the
LO input
to
any
source
of
more
than
1400
volts
(peak)
above
earth
ground.
2-14.
Tilt
Bail/Handle.
2-15.
The 16 position
tilt
bail/handle
allows
you
to
position
the
instrument
for
the
best
viewing
angle
of the
display.
2-16.
INITIAL
FUNCTIONAL CHECK.
Z-17.
Now that
the
batteries
are
installed
and you
have
become
familiar
with
your
OMM, the
initial
checkout
procedure
given
in Table
2-1 should
be per-
formed.
This
procedure
provides
d quick
and easy
functional
check
of
the
DMM.
Only
test
leads
are
required.
The check
is designed
to cause
all
annun-
ciators
to
appear,
except
for
low
battery
(BAT).
All
decimal
point
locations
are
checked.
All
digit
segments
are
checked,
except
for
the
horizontal
cen-
ter
segment
on the
last
three
digits.
Since
the
minus
sign
(-)
is
not
suppressed
on any function,
it
should
periodically
flash
on
one
or
snore
of
the
funcrions
at
zero
with
the
input
shorted.
By
selecting
two
functions
and/or
ranges
in
the
test,
the
current
fuse
is
checked
and d rough
indication
of
the
condition
of the
respective
current
shunt
and
range
resistor
is
obtained.
However,
this
test
is
not
intended
to
check
the
DMM accuracy,
and thus,
the
indicated
readings
in the
table
are
nominal
with
*5 digits
allowed.
If
it
is
desired
to
check
the
DMM accuracy
specifications,
perform
the
Performance
Verification,
Section
3.
The
Initial
Functional
Check
is
begun
with
power
on and
all
other
push-
buttons
wt.
To obtain
this
condition
it
may be
necessary
to
press
unselected
function
and
range
pushbuttons
slightly
to
cancel
previous
selections.
After
completing
the
functional
check,
operate
the
Model
169 in
accordance
with
the
Operating
Instruc-
tions
beginning
with
Paragraph
2-18.
Z-18.
OPERATING INSTRUCTIONS.
2-19.
The basic
operating
instructions
for
the
Model
169
DMM are outlined
below.
In addition,
there
are
individual
instructions
provided
in this
section
which
describe
how to nakt
specific
function
meas"rements.
Refer
to Figure
2-3 and operate
the
DMM as follows.
A
CAUTION
Do
not
exceed
the
maximum
input
limits
given
in Table
2-2.
a.
Turn
on power
by depressing
the
ON/OFF push-
button.
If
the
instrument
is within
I&28"C,
it
is
useable
immediately
to
rated
accuracy.
If
the
ambient
temperature
is within
18-28°C
range,
but
the
DMM has been
subjected
to
temperature
extremes,
up
to I hour
may be required
to obtain
rated
accuracy.
b.
Select
the
function
with
the
AC/DC,
V, A or n
pushbuttons.
c.
Select
the
range
by depressing
the
appropriate
range
pushbutton.
d.
Connect
the
source
to the
INPUT jacks
and make
the
medsupement.
Accessories
described
in Section
4
should
be used ds required.
TABLE 2-2
Sumnary
of Maximum Inputs
MAXIMUM
INPUT
1OOOV DC, 1400V Peak AC
350V rms continuous,
15
sec.
maximum above 350V
IOOOV rms,
1400 peak,
lO%.Hz
ZA, 250V DC or rms (fuse
protected)
-
2-4
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